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The U.S. Department of Energy
Computer Incident Advisory Capability
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INFORMATION BULLETIN
Hewlett-Packard rexec Command Security Vulnerability
[Hewlett-Packard Security Bulletin HPSBUX0304-257 SSRT3496]
May 1, 2003 20:00 GMT Number N-088
[Revised 23 July 2003]
______________________________________________________________________________
PROBLEM: There is a buffer overflow in the HP-UX rexec program that
could allow an unprivileged user to run commands as root. The
HP-UX rexec program runs as SUID root, causing any code that is
run as part of an exploit of the buffer overflow to also run as
root. The patch involves replacing libc, which could have
security implications for other programs on the system.
PLATFORM: HP 9000 Series 700, 800, 10.20 and 11.00.
DAMAGE: An unprivileged user can run commands as root.
SOLUTION: Install patches and replace libc as described in HP's bulletin.
______________________________________________________________________________
VULNERABILITY The risk is MEDIUM. The vulnerability may allow an unprivileged
ASSESSMENT: user to increase their privileges, therefore the potential to
run as root.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-088.shtml
______________________________________________________________________________
Revision History: 7/23/2003 - HP-UX revision of affected filesets and the
fileset revision or patch containing the fix.
[***** Start Hewlett-Packard Security Bulletin HPSBUX0304-257 SSRT3496 *****]
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**REVISED 01**
Source: HEWLETT-PACKARD COMPANY
SECURITY BULLETIN: HPSBUX0304-257
Originally issued: 29 April 2003
Last revised: 22 July 2003
SSRT3496 Potential Security Vulnerability in rexec
-----------------------------------------------------------------
NOTICE: There are no restrictions for distribution of this
Bulletin provided that it remains complete and intact.
The information in the following Security Bulletin should be
acted upon as soon as possible. Hewlett-Packard Company will
not be liable for any consequences to any customer resulting
from customer's failure to fully implement instructions in this
Security Bulletin as soon as possible.
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PROBLEM: Potential buffer overflow in rexec(1)
IMPACT: Potential increase in privilege.
PLATFORM: HP-UX B.10.20, B.11.00, and B.11.04.
SOLUTION: B.10.20 - install PHCO_26158 or subsequent.
B.11.00 - install PHCO_24723 or subsequent.
--> B.11.04 - install PHCO_29190 or subsequent.
MANUAL ACTIONS: No
AVAILABILITY: All patches are available.
CHANGE SUMMARY: Rev.01 - Added PHCO_26158.
Added PHCO_29190.
Added AFFECTED VERSIONS section.
-----------------------------------------------------------------
A. Background
The SSRT thanks Davide Del Vecchio for
reporting this potential vulnerability to HP.
HP Tru64 UNIX is not vulnerable to this reported problem.
--> AFFECTED VERSIONS
-->
--> The following is a list by HP-UX revision of
--> affected filesets and the fileset revision or
--> patch containing the fix. To determine if a
--> system has an affected version, search the
--> output of "swlist -a revision -l fileset"
--> for an affected fileset, then determine if
--> a fixed revision or the applicable patch is
--> installed.
-->
--> HP-UX B.11.04
--> =============
--> OS-Core.C-MIN
--> OS-Core.CORE-SHLIBS
--> fix: PHCO_29190 or subsequent
-->
--> HP-UX B.11.00
--> =============
--> OS-Core.C-MIN
--> OS-Core.CORE-SHLIBS
--> fix: PHCO_24723 or subsequent
-->
--> HP-UX B.10.20
--> =============
--> OS-Core.C-MIN
--> OS-Core.CORE-SHLIBS
--> fix: PHCO_26158 or subsequent
B. Recommended solution
**REVISED 01**
-->B.11.04 - Install PHCO_29190 or subsequent.
B.11.00 - Install PHCO_24723 or subsequent. PHCO_24723 has
been superseded. To find the recommended
superseding patch and the latest superseding patch,
search the technical knowledge base on itrc.hp.com
for "PHCO_24723".
-->B.10.20 - Install PHCO_26158.
C. To subscribe to automatically receive future NEW HP Security
Bulletins from the HP IT Resource Center via electronic
mail, do the following:
Use your browser to get to the HP IT Resource Center page
at:
http://itrc.hp.com
Use the 'Login' tab at the left side of the screen to login
using your ID and password. Use your existing login or the
"Register" button at the left to create a login, in order to
gain access to many areas of the ITRC. Remember to save the
User ID assigned to you, and your password.
In the left most frame select "Maintenance and Support".
Under the "Notifications" section (near the bottom of
the page), select "Support Information Digests".
To -subscribe- to future HP Security Bulletins or other
Technical Digests, click the check box (in the left column)
for the appropriate digest and then click the "Update
Subscriptions" button at the bottom of the page.
or
To -review- bulletins already released, select the link
(in the middle column) for the appropriate digest.
NOTE: Using your itrc account security bulletins can be
found here:
http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin
To -gain access- to the Security Patch Matrix, select
the link for "The Security Bulletins Archive". (near the
bottom of the page) Once in the archive the third link is
to the current Security Patch Matrix. Updated daily, this
matrix categorizes security patches by platform/OS release,
and by bulletin topic. Security Patch Check completely
automates the process of reviewing the patch matrix for
11.XX systems. Please note that installing the patches
listed in the Security Patch Matrix will completely
implement a security bulletin _only_ if the MANUAL ACTIONS
field specifies "No."
The Security Patch Check tool can verify that a security
bulletin has been implemented on HP-UX 11.XX systems providing
that the fix is completely implemented in a patch with no
manual actions required. The Security Patch Check tool cannot
verify fixes implemented via a product upgrade.
For information on the Security Patch Check tool, see:
http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/
displayProductInfo.pl?productNumber=B6834AA
The security patch matrix is also available via anonymous
ftp:
ftp://ftp.itrc.hp.com/export/patches/hp-ux_patch_matrix/
On the "Support Information Digest Main" page:
click on the "HP Security Bulletin Archive".
The PGP key used to sign this bulletin is available from
several PGP Public Key servers. The key identification
information is:
2D2A7D59
HP Security Response Team (Security Bulletin signing only)
<security-alert@hp.com>
Fingerprint =
6002 6019 BFC1 BC62 F079 862E E01F 3AFC 2D2A 7D59
If you have problems locating the key please write to
security-alert@hp.com. Please note that this key is
for signing bulletins only and is not the key returned
by sending 'get key' to security-alert@hp.com.
D. To report new security vulnerabilities, send email to
security-alert@hp.com
Please encrypt any exploit information using the
security-alert PGP key, available from your local key
server, or by sending a message with a -subject- (not body)
of 'get key' (no quotes) to security-alert@hp.com.
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(c)Copyright 2003 Hewlett-Packard Company
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
in this document is subject to change without notice.
Hewlett-Packard Company and the names of HP products referenced
herein are trademarks and/or service marks of Hewlett-Packard
Company. Other product and company names mentioned herein may be
trademarks and/or service marks of their respective owners.
________________________________________________________________
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[***** End Hewlett-Packard Security Bulletin HPSBUX0304-257 SSRT3496 *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Hewlett-Packard Company for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
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This document was prepared as an account of work sponsored by an
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Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
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